Rails - Nov 2013 - Creation of object which doesn't have model, while creation need to create several entries in other

In application user can enter new *post* which contain *title*, *content*of the
post and
*category* of post. So creating new post will be through some simple html 
form with few fields. Now i don''t know where to put logic for creating
new
post for following reasons:

Post(or posts collection) is object which is constructed from different 
tables, for example.

@posts = User.joins(entries: [{storage: :vote}, :category]) 
             .where("votes.count > ?", 0)
             .select("users.username AS username,
                      storages.id AS storage_id,
                      storages.title AS title, 
                      storages.content AS content, 
                      votes.count AS votes, 
                      categories.category_name AS category_name")
             .order("votes.count DESC")

So when user create *new post* application must create new entries in 
different tables:

1.Create new entry in *entries* table. (id, user_id, category_id)
2. Create new entry in *storages* table.(id, title, content, entry_id) 
3. Create new entry in *vote* table.(id, count, storage_id) 

In situation where *post* is model i can use something like resources: poststhen
in posts controller through
new and create i can create new post, *but what in situation like this 
where i don''t need posts controller nor post model?* So, question is:
which
place is more appropriate to put logic for creating new post? *Question1*

My solution is to craete Storages controller with resource: storages, :only 
=> [:new, :create] then through new and create of this controller to 
populate different tables in db? I''m forcing here only because i dont
see
any point of other CRUD actions here(like showing all or one storage), 
because i will not use storages individually but in conjunction with other 
tables. So from views/storages through new.html.erb and create.html.erb i 
can construct new *post*? *Question2*

Another solution is to create Post controller which doesn''t have 
"corresponding" post model as i stated before. Here i''m
guessing i can''t
use restful routes(CRUD) because there is not :id of post? I only can make 
manually non-restful routes like:
post ''posts/create/:title/:content/:category'' =>
''posts#create'', :as =>
''create_post'' then from params[:title], params[:content] and 
params[:category] to populate other tables. 

*Question3*I assume that i need tableless-model for post?

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